Cutout "B" Gear Change

Models 107 and 126 with 8-cylinder engines are provided with a kickdown cutout since September 1981, model 124 since start of series, as well as models 123 and 126 with engine 617.95 (USA) starting model year 1985. As a result, the kickdown shiftpoints could he raised.

Kickdown Cutout
To utilize the engine up to max. speed during kickdown gearshift, the kickdown upshift is hydraulically placed above max. speed of engine. But just before attaining max. speed, the kickdown flow is electronically interrupted (fuel pump relay or control unit compressor cutout). This will guarantee that the transmission will shift to the next higher gear shortly before max. engine speed.

"B" Gearshift
During a "B" gearshift switch (S6O) is actuated and current will flow to switchover valve, automatic transmission (Y3). A decel brake shift 2-1 below 40 km/h is not possible and 1st gear can now be used for braking. The 1st gear remains at a speed of 50-60km/h (installed since September 1981).

Moving off, 1st gear vehicle with engine 117. installed from May 1980 to August 1985
In driving position "3" and "2" current will flow via starter interlock and backup lamp switch (S16/1) and relay. moving off 1st gear (N23) to switchover valve, automatic transmission (Y3) and 1st gear will be engaged. As from a speed of approx. 12 km/h (signal comes from speedometer cruise control connection) the current to magnetic valve is interrupted by the control unit moving off 1st gear and the transmission will shift into 2nd gear (refer to wiring diagrams).